It's probably the third keyboard shortcut you learned on first using a computer—Ctrl-Z is "Undo." Commenter Prarie Moon helpfully reminds us that this key combo does more than just fix text mistakes. It also un-deletes files and fixes renaming mistakes.

Microsoft only provides a vague description of Ctrl+Z, noting that it "Undoes the last action" in Windows and most applications. If you've run through a folder and deleted a bunch of individual files, though, Ctrl+Z is a much easier fixer than heading to your Recycle Bin and right-clicking the particular file you want to save, as Prarie Moon writes (and for the most part, the same applies to OS X and Cmd+Z):

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In Windows, ctrl+z goes well beyond correcting typos:

Delete a file to the Recycle Bin from a folder window, and ctrl+z brings it back. It even brings back a bunch of files if you've deleted them in a single pass.

Ctrl+z also has many levels of undo when it comes to renaming files. Name a file whatever, realize you made a mistake, use ctrl+z right away, and you've unmade it. If you don't go off and do anything else right away, multiple un-renamings are possible. Try it for yourself.

What else does Ctrl+Z do that we've collectively forgotten about, or never bothered to learn? Tell us your tip in the comments.